“School of Astronomy”

Back to Papers Home
Back to Papers of School of Astronomy

Paper   IPM / Astronomy / 17012
School of Astronomy
  Title:   Dark matter from entropy perturbations in curved field spac
1.  Hassan . Firouzjahi
2.  Mohammad Ali . Gorji
3.  Shinji . Mukohyama
4.  Alireza . Talebian
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  105
  Year:  2022
  Supported by:            ipm IPM
The accumulated energy density of the excited entropy modes in multiple field inflationary scenarios can play the role of dark matter. In the usual case of a flat field space without any turning trajectory, only light superhorizon entropy modes can be excited through the gravitational instability. In the case of a negatively curved field space, we show that subhorizon entropy modes can be excited as well through the tachyonic instability induced by the negative curvature of the field space. The latter allows for production of entropy modes with masses larger than or at the order of the Hubble expansion rate during inflation, leading to a new dark matter scenario. Due to the contribution of subhorizon modes, the corresponding spectral density has a peak at a scale smaller than its counterpart in the models based on a flat field space. This difference makes our model observationally distinguishable.

Download TeX format
back to top
scroll left or right